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Is there a standard sign function (signum, sgn) in C/C++?
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513
Surprised no one has posted the type-safe C++ version yet:
template <typename T> int sgn(...
How do I ZIP a file in C#, using no 3rd-party APIs?
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Are you using .NET 3.5? You could use the ZipPackage class and related classes. Its more than just zipping up a file list because it wants a MIME type for each file you add. It might do what you want.
I'm currently using these classes for a...
Convert the values in a column into row names in an existing data frame
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138
This should do:
samp2 <- samp[,-1]
rownames(samp2) <- samp[,1]
So in short, no there i...
Removing numbers from string [closed]
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edited Oct 12 '12 at 3:54
answered Oct 12 '12 at 3:34
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Shell command to sum integers, one per line?
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Replacement for “rename” in dplyr
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dplyr version 0.3 added a new rename() function that works just like plyr::rename().
df <- rename(df, new_name = old_name)
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imp...
byte + byte = int… why?
...re first cast to integers and the result of addition of two integers is a (32-bit) integer.
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Display name of the current file in vim?
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answered Nov 6 '10 at 3:27
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is there a Java equivalent to null coalescing operator (??) in C#? [duplicate]
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136
Sadly - no. The closest you can do is:
int y = (x != null) ? x : -1;
Of course, you can wra...